make (no) space after type assertion user configurable

[kevinlang]

Fixes #10362

[msftclas]

Hi @gnalck, I'm your friendly neighborhood Microsoft Pull Request Bot (You can call me MSBOT). Thanks for your contribution!

In order for us to evaluate and accept your PR, we ask that you sign a contribution license agreement. It's all electronic and will take just minutes. I promise there's no faxing. https://cla.microsoft.com.

TTYL, MSBOT;

[msftclas]

@gnalck, Thanks for signing the contribution license agreement so quickly! Actual humans will now validate the agreement and then evaluate the PR.

Thanks, MSBOT;

[mhegazy]

this should be optional, otherwise all users of the API have to specify it.

[mhegazy]

@gnalck thanks for the PR, and extremely sorry for the delay.

can you refresh the PR against master. modulo one comment, I think this PR is ready to go.

[mhegazy]

manually merged. thanks!

[kevinlang]

sweet, thanks!

[ydogandjiev]

@mhegazy, @gnalck, hey guys, I'm super excited to use this feature in order to make the auto-format functionality compliant with my team's tslint rules. Unfortunately, I can't seem to set the insertSpaceAfterTypeAssertion option in my VSCode settings. It doesn't appear as an option and even if I manually enter it, the setting seems to have no effect:
"typescript.format.insertSpaceAfterTypeAssertion": true,

What am I missing here? Has this feature been officially released yet?

[csentis]

@ydogandjiev I had asked the same in microsoft/vscode#10296 - glad to see that it got assigned to @mjbvz. Looking forward to this implemented, too!

[lucap86]

I have a trouble with this feature.

with

let a = <number[]>["1", "2", "3", "4"]

no space is added after <number[]>

otherwise if i have

let a = <number>"1"

it correctly add a space after <number>